Heat radiating structure for use in image projecting apparatus

Abstract

Disclosed herein is a heat radiating structure for radiating the heat generated by a lamp in an image projecting apparatus for projecting an image onto a screen to display the image thereon, including a heat sink for radiating heat generated by the lamp, the heat sink including heat transfer means for transferring the heat from the lamp, the heat transfer means being held in close contact with the lamp, heat storage means for storing the heat transferred from the lamp through the heat transfer means, and a plurality of fins serving as heat radiating means for radiating the heat stored by the heat storage means, wherein the heat transfer means, the heat storage means, and the heat radiating means are of a separable structure.

1. A heat radiating structure for radiating the heat generated by a lamp in an image projecting apparatus for projecting an image onto a screen to display the image thereon, comprising:
 a heat sink for radiating heat generated by said lamp; 
 said heat sink including: 
 heat transfer means for transferring the heat from said lamp, said heat transfer means being held in close contact with said lamp; 
 heat storage means for storing the heat transferred from said lamp through said heat transfer means, said heat storage means directly contacting and substantially surrounding said heat transfer means; 
 a plurality of fins serving as heat radiating means for radiating the heat stored by said heat storage means; 
 wherein said heat transfer means, said heat storage means, and said heat radiating means are of a separable structure; 
 heat transfer accelerating means disposed between said lamp and said heat transfer means; and 
 wherein the heat transfer accelerating means includes silicon grease. 
 
   
   
     2. The heat radiating structure according to  claim 1 , wherein said heat transfer means is shaped complementarily to said lamp, and is replaceable depending on the lamp used. 
   
   
     3. The heat radiating structure according to  claim 1 , wherein said heat radiating means is removably mounted on said heat storage means so that heat radiating means having a different heat radiating area and made of a different material may be mounted on said heat storage means depending on the temperature to which said lamp is heated. 
   
   
     4. The heat radiating structure according to  claim 1 , wherein said heat transfer means is made of a material different from said heat storage means and said heat radiating means. 
   
   
     5. The heat radiating structure according to  claim 1 , further comprising:
 heat transfer accelerating means disposed between said heat transfer means and said heat storage means. 
 
   
   
     6. The heat radiating structure according to  claim 1 , wherein said heat radiating means has small surface irregularities on a surface thereof. 
   
   
     7. The heat radiating structure according to  claim 1 , wherein said heat radiating means is inclined at an angle to said heat storage means so as to be oriented in a direction in which cooling air from a cooling fan is applied to said heat radiating means. 
   
   
     8. The heat radiating structure according to  claim 1 , wherein said heat storage means has voltage applying means for applying a voltage between electrodes of said lamp. 
   
   
     9. The heat radiating structure according to  claim 8 , wherein said voltage applying means has electrode terminals for applying said voltage, said electrode terminals being insulated from each other by an air layer. 
   
   
     10. The heat radiating structure according to  claim 1 , wherein said lamp further includes a casing filled with high-pressure xenon gas. 
   
   
     11. The heat radiating structure according to  claim 1 , wherein said lamp further includes a front casing and a rear casing that serve as electrodes. 
   
   
     12. The heat radiating structure according to  claim 1 , wherein the plurality of fins are oriented in a direction perpendicular to an optical axis of the lamp and are disposed symmetrically with respect to the heat storage means. 
   
   
     13. The heat radiating structure according to  claim 1 , wherein the plurality of fins are detachably fastened to the heat storage means by screws. 
   
   
     14. The heat radiating structure according to  claim 1 , further comprising a cooling fan wherein the cooling fan provides cooling air obliquely to heat storage means. 
   
   
     15. A heat radiating structure for radiating the heat generated by a lamp in an image projecting apparatus for projecting an image onto a screen to display the image thereon, comprising:
 a heat sink for radiating heat generated by said lamp; 
 said heat sink including: 
 heat transfer means for transferring the heat from said lamp, said heat transfer means being held in close contact with said lamp; 
 heat storage means for storing the heat transferred from said lamp through said heat transfer means, said heat storage means directly contacting and substantially surrounding said heat transfer means; 
 a plurality of fins serving as heat radiating means for radiating the heat stored by said heat storage means; 
 wherein said heat transfer means, said heat storage means, and said heat radiating means are of a separable structure; 
 wherein said heat transfer means further includes an external surface, said heat storage means further includes a internal and external surfaces, and said heat radiating means further includes a internal surface; and 
 wherein said external surface of said heat transfer means directly contacts said internal surface of said heat storage means and said external surface of said heat storage means directly contacts said internal surface of said heat radiating means. 
 
   
   
     16. The heat radiating structure according to  claim 15 , wherein the external surface of said heat transfer means are substantially cylindrical, the internal surface of said heat storage means is substantially cylindrical, the external surface of said heat storage means is substantially planer, and the internal surface of said heat radiating means is substantially planer. 
   
   
     17. The heat radiating structure according to  claim 1 , further comprising, a housing that substantially encapsulates said lamp and said heat sink and wherein said housing includes a cover that can be opened to replace said lamp.